First estimate of the time delay in HE 1104-1805
ADS bibcode 1998A&A...339L..73W
astro-ph/9810181
L. Wisotzki [1], O. Wucknitz [1], S. Lopez [1], A.N. Sørensen [2]
- Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
- Copenhagen University Observatory, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
Abstract
We present first results from five years of spectrophotometric
monitoring of the bright double QSO and gravitational lens
HE 1104-1805. The quasar has varied considerably over this
time, while the emission line fluxes appear to have
remained constant. We have constructed monochromatic continuum
light curves for components A and B, finding that B leads
the variability. A quantitative analysis with the Pelt method
gives a best estimate for the light travel time delay
of about 0.73 years, although a value as low as 0.3 cannot
yet be excluded. We discuss possible models for the QSO-lens
configuration and use our measured time delay to predict the
redshift of the lens, zd. Finding that most likely
zd<=1, we can rule out the
hitherto favoured values of zd=1.32 or 1.66.
A new candidate is an absorption system at z=0.73,
but the lens could also be an elliptical not detected
in absorption.
Key words:
quasars: individual: HE 1104-1805 quasars: general gravitational lensing
A&A 339 (1998) L73 (link to online journal)
ADS bibcode 1998A&A...339L..73W (link to ADS entry)
astro-ph/9810181 (link to e-print archive)
download full article
gzipped postscript file (52.1 kB, last change 10 Oct 1998)
unzipped postscript file (211.0 kB)
To publications
To my homepage
To the AIfA
To the University of Bonn
Script last modified on 7 Sep 2010
Last change to this data base entry on 3 Jul 2002